Evaluation and Strengthening of the Flexural Behavior of 45-Year-Old Precast PC Hollow-Core Slabs

WANG Guolin; YE Nan; MIAO Yulin; Tang Yuhua; ZHANG Rong

doi:10.3724/j.gyjzG26031503

Volume 56 Issue 5

May 2026

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WANG Guolin, YE Nan, MIAO Yulin, Tang Yuhua, ZHANG Rong. Evaluation and Strengthening of the Flexural Behavior of 45-Year-Old Precast PC Hollow-Core Slabs[J]. INDUSTRIAL CONSTRUCTION, 2026, 56(5): 141-147. doi: 10.3724/j.gyjzG26031503

Citation:

WANG Guolin, YE Nan, MIAO Yulin, Tang Yuhua, ZHANG Rong. Evaluation and Strengthening of the Flexural Behavior of 45-Year-Old Precast PC Hollow-Core Slabs[J]. INDUSTRIAL CONSTRUCTION, 2026, 56(5): 141-147. doi: 10.3724/j.gyjzG26031503

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Evaluation and Strengthening of the Flexural Behavior of 45-Year-Old Precast PC Hollow-Core Slabs

doi: 10.3724/j.gyjzG26031503

1. Faculty of Urban Construction and Ecological Technology, Shanghai Institute of Technology, Shanghai 201418, China;
2. Shanghai Construction and Management Commission, Shanghai 201499, China;
3. Shanghai Tangyi Construction Engineering Management Co., Ltd., Shanghai 201400, China

Received Date: 2026-03-15
Available Online: 2026-06-06
Publish Date: 2026-05-20

Abstract

Abstract

Many existing rural houses face structural safety hazards due to material performance degradation. This study investigated the residual bearing capacity and the strengthening effect of carbon fiber reinforced polymer （CFRP） sheets on old precast prestressed concrete （PC） hollow-core slabs， using specimens obtained from a demolished 45-year-old rural house in Shanghai. The test involved two PC slabs： one served as the control specimen， and the other was strengthened with CFRP sheets. Static loading tests were conducted to compare and analyze their failure modes， deformation capacity， and energy dissipation capacity. Based on the measured data， the strain development pattern of the CFRP sheets was analyzed. The results showed that the 45-year-old PC hollow-core slabs still had a certain bearing capacity but with a low safety margin， exhibiting a typical brittle flexural failure due to under-reinforcement. After CFRP strengthening， the failure mode changed to shear failure with obvious ductile characteristics， because the CFRP sheets bore the main tensile stress in the later loading stage.
- existing rural buildings,
- precast prestressed concrete hollow-core slabs,
- CFRP sheet strengthening,
- flexural behavior

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References(23)

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